Researchers led by synthetic biologist George Church have demonstrated that two separate genetic codes can operate at the same time in a laboratory setting. The genetic code translates DNA sequences into protein sequences and is nearly universal across all living organisms, making it difficult to modify without affecting existing cellular functions. Previous work has added new amino acids to bacterial cells or re‑engineered entire genomes to accommodate alternative codes, a process that requires extensive changes to many genes. In this study, the team designed two populations of transfer RNAs that differ only at a short sequence region and created corresponding ribosomes with altered RNA interactions, allowing each ribosome to recognize only its matching tRNA set. Using a cell‑free translation system that incorporated robotics, next‑generation sequencing, and analytical chemistry, the researchers showed that each ribosome–tRNA pair can translate a shared messenger RNA to produce a different protein, confirming that two orthogonal genetic codes can function concurrently. The authors noted that the approach has been validated only in vitro; introducing the dual code into living cells could disrupt normal protein synthesis and lead to malformed proteins, so further testing is required. The work provides a new method for constructing synthetic genetic circuits and may accelerate synthetic biology applications, though the practical implications remain to be explored.